Tweak phrasing describing the AB's composition

See #540

index.bs

@@ -587,11 +587,10 @@ Advisory Board Participation</h4>
 	The CEO and Team Contact have a standing invitation
 	to all regular Advisory Board sessions.
 
-	The remaining nine to eleven [=Advisory Board=] participants are elected by the W3C [=Advisory Committee=]
+	The nine to eleven [=Advisory Board=] participants are elected by the W3C [=Advisory Committee=]
 	following the <a href="#AB-TAG-elections">AB/TAG nomination and election process</a>.
 
-	With the exception of the Chair,
-	the terms of all Advisory Board participants are for <span class="time-interval">two years</span>.
+	The terms of elected Advisory Board participants are for <span class="time-interval">two years</span>.
 	Terms are staggered so that each year,
 	either five or six terms expire.
 	If an individual is elected to fill an incomplete term,